Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

Measure

Percentile

Measure	Percentile
0	0
0.04	1
0.04	2
0.05	3
0.06	4
0.07	5
0.07	6
0.09	7
0.10	8
0.11	9
0.12	10
0.13	11
0.15	12
0.17	13
0.18	14
0.20	15
0.22	16
0.23	17
0.24	18
0.26	19
0.28	20
0.29	21
0.31	22
0.32	23
0.34	24
0.36	25
0.38	26
0.39	27
0.41	28
0.43	29
0.45	30
0.47	31
0.48	32
0.51	33
0.52	34
0.54	35
0.56	36
0.58	37
0.60	38
0.62	39
0.64	40
0.66	41
0.68	42
0.70	43
0.72	44
0.75	45
0.77	46
0.79	47
0.82	48
0.84	49
0.86	50
0.88	51
0.91	52
0.94	53
0.96	54
1.01	55
1.03	56
1.05	57
1.08	58
1.11	59
1.15	60
1.18	61
1.21	62
1.25	63
1.29	64
1.32	65
1.36	66
1.40	67
1.45	68
1.48	69
1.52	70
1.57	71
1.61	72
1.67	73
1.71	74
1.77	75
1.82	76
1.87	77
1.93	78
2.00	79
2.05	80
2.11	81
2.18	82
2.25	83
2.34	84
2.42	85
2.52	86
2.62	87
2.73	88
2.85	89
3.00	90
3.13	91
3.30	92
3.47	93
3.65	94
3.88	95
4.18	96
4.53	97
5.06	98
5.90	99
11.00	100